OPTO Switch Winder December 15, 2018UncategorizedArduino Counter, Arduino Powered Pickup Winder, OPTO Interrupter Switch, Pickup Winder, Punch Counter, TM1637 DisplayChase Weatherford Arduino Counter for Pickup Winder 2.0 with OPTO Interrupter Switch. In this video I show how I am using an Arduino to count rotations on a motor by using an Ardunio Nano a TM1637 Display and an OPTO Interrupter switch. Ill be using this setup to build a counter for a pickup winder but it can be used for many other purposes. Hope you enjoy. Link to Article-